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depends where the wt. is lost the effect it will have.
assuming a constant starting speed for a set distance for comparison
losing 15 lbs. of dead wt. on the car would net .20 speed change = 2.14hp
losing 15 lbs. rotating wt. axle speed is worth .60 speed change = 6.42 hp
losing 15 lbs. rotating at engine speed is worth 3.00 speed change =32.10 hp
so reducing rotational inertia on driveline has 15 times benefit of just reducing wt. of car assuming 13 inch dia. disc mounting to crankshaft flange. components rotating at axle speed are 3 times as effective as non-rotating components.
from chassis engineering by herb adams pg. 109
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